Solid polymer electrolyte and electrochemical devices comprising same
a polymer electrolyte and solid-state technology, applied in the field of materials, can solve the problem that the electrolyte material proposed in this document does not have sufficient mechanical properties to be used alone in a battery
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example 1
[0099]Step a: A eutectic mixture was prepared by mixing lithium bis(trifluoromethanesulfonyl)imide (LiTFSI; 7.9 g) with N-methylacetamide (7.1 g) under a nitrogen atmosphere and at ambient temperature. The mixing is performed until a colorless liquid is obtained at ambient temperature.
[0100]Step b: An additional amount of LiTFSI (10.0 g) was dissolved in triethylene glycol diacrylate (17.4 g) at a temperature of 40° C. After returning to ambient temperature, 2.6 g of this solution were added to the eutectic mixture formed during step a. PVDF (15 g) and then the photoinitiator (IRGACURE® 184, sold by the company BASF, 0.3 g) were added to the whole of the formulation with stirring.
[0101]Step c: The preparation obtained in step b was spread in the form of a film using a BYK automatic film applicator. For this, 5 g of the formulation obtained in step b were placed on a sheet of aluminum 30 μm thick. A gage which makes it possible to adjust the applied liquid formulation height was adju...
example2
[0106]The protocol of example 1 was reproduced, with the difference that silica (3 g, specific surface area 160 m2 / g, mean particle size 300 μm) was mixed with 10 g of the solution previously obtained in step b.
[0107]A film on average 165 μm thick was obtained. An ionic conductivity of 10−4 S / cm at a temperature of 23° C. was obtained.
[0108]The measurement of the solidity of the film obtained was carried out by compression using superimposed films in order to obtain a test specimen with a thickness greater than 1 mm. The cylindrical test specimens were cut out using a hole punch with a diameter between 5 and 15 mm. The tests were carried out by dynamic mechanical analysis on a Rheometrics RSA 2 device which makes it possible to apply a sinusoidal strain and to measure the corresponding force. The modulus measured is the tangent to the stress / strain curve for a strain of 1% at a frequency of 1 Hz and a temperature of 23° C. The Young's modulus of this film thus determined leads to a ...
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